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Abstract: The distribution and chemical state of Si in a synthetic 2-line ferrihydrite with a Si/(Si + Fe) molar ratio of 0.11 was studied. Heat treatment under oxidizing conditions shows that Si-rich...
Khmaralite, Ca Mg Fe Fe Al Be B Si O , is a new mineral closely related to.04 5.46 14.26 1.43 0.02 4.80 400.12 1.87sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamo...
Theclustervariationmethod(CVM)fordeterminingthethermodynamicsofbothshort- rangeandlong-rangeorderinthisstudywasextendedtocomplexaluminosilicateminerals. Usingrecentlydevelopedalgorithmsforthemaximiz...
Theequationsofstateof A2/a titanitephasesofCaTiSiO ,Ca(Ti Si )SiO ,andCaSi O5 0.5 0.5 5 2 5 havebeendeterminedfromhigh-pressureX-raydiffractionmeasurements.Theisothermal bulkmoduliare K 131.4(7)GPa(...
29The SiMASNMRspectrumofarmenitefromWasenalp(Valais,Switzerland)indicates completeSi,Alordering.Thesamechemicalshifts(82.3,95.0,and101.8ppm)were alsomeasuredforarmenitefromRe!migny(Quebec,Canada),ho...
The shear viscosities of melts in the system Na-Fe-Si-O-F-Cl were determined over a wide range of temperatures (400–1200 8 C) at 1 atm pressure in air. The compositions are based on the addition of Fe...
Boralsilite, the first natural anhydrous Al-B-silicate, is a high-temperature phase in peg-matites cutting granulite-facies metapelitic rocks at Larsemann Hills, Prydz Bay, east Ant-arctica (type loca...
Twoseriesofleucitegroupmaterials,withK,Rb,andCsasextra-frameworkcations,havebeensynthesizedbyionexchangefromanaturalwell-orderedanalciteandanatural29 27disorderedleucite.Siand AlMASNMRdatafortheanalci...
Thestructureofmozartite,CaMn O[SiO OH],wasre?nedinspacegroup P2 2 2 fromX-raysingle-crystaldatacollectedat100K(R 2.45%, R 2.62%),300K(R 2.60%,R 2.68%),and500K(R 2.79%, R 2.81%).TheMn O octahedronshows...
AnexperimentalmethodforthedeterminationofAb-OrexsolutionandAl-Siordering inalkalifeldsparisdescribed.Powderinfraredspectroscopywasusedtomeasurespectra1 inthespectralrangebetween50and1500cm usingabo...
Aseriesofaluminoustremoliteswassynthesizedat800¤C85Cand6¤C13kbaralonthejoinCa Mg Si O (OH) -Ca (Mg Al)(AlSi )O (OH) bymeansoftheMg-Tscher- makssubstitution.Althoughtheamphiboleyieldswerehigh(97¤C99w...
We present 29SiMAS-NMR spectroscopic data for a series of synthetic feldspar samples along the join CaAI2Si20g-SrAI2Si20g, from which the composition dependence and cou- pling of order parameters de...
The enthalpy ofordering ofAland Sibetween tetrahedral sites in framework structures is now known from several studies to bein the range 0.3-1.4 eVper two Al-O-Si linkages, depending on the structure a...
Bechererite is a new mineral found ondump material from the Tonopah-Belmont mine, Maricopa County, Arizona, U.S.A. It occurs as thin elongated crystals, commonly in hemispherical aggregates, and it is...
Si K- and L-edge X-ray absorption near-edge structure (XANES) of SiOz-PzOs and NazO-SiOz-PzOs glasses containing PzOsabove 30mol%wereinvestigated using synchro-tron radiation. BothSiK-and L-edge spect...

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